Siclic33, Sorry, you are wrong on the definition of shift. The JR and Airtonics systems transmitt a freqency which varies above the nominal (your channel frequency) by approximatelly 5 KC while the Negative shift transmitters frequency shifts down approximately 5KC as the FM signal is modulated. Servo direction has no relationship to positive or negative shift, rotational direction is determined by how the feedback pot in the servo and servo motors are wired. You can change any servos direction of rotation by simply reversing the two leads to the motor and interchanging the two outside leads on the pot. You might want to check out www.torrypinesgulls.org/Radios.htm for more specific information.